A sheet metal double bending method

Abstract

The invention discloses a sheet metal re-bending method, which is to adjust the Z axis of the bending knife to rise or fall, and move the X axis forward at the same time, so that the bending knife bends in a circular arc, and bends the workpiece by more than 90°, and then the Z and X axes of the bending knife retreat again to the position of the second knife bending preparation, the W axis upper pressing knife is lifted, and the bending workpiece is released, the U axis assembly conveys the bending workpiece forward, and the W axis upper pressing knife is pressed down to press the bending workpiece, the Z axis of the bending knife continues to bend upward or downward, and the X axis bends forward, and the X axis and the Z axis multi-axis linkage operation make the bending knife continue to bend in a circular arc, and the bending angle is continuously increased by the above bending method, so as to realize the large-angle bending of the bending workpiece. The invention improves the forming efficiency of large-angle bending of sheet metal and reduces the production cost, gets rid of the limitation of bending molds and manual verification, makes bending more flexible and changeable, and realizes intelligent and automatic bending process through re-bending and bending forming.

Description

Technical Field

[0001] The invention relates to the technical field of automated bending, in particular to a sheet metal multiple bending method. Background Art

[0002] In the prior art, in the bending technology of sheet metal, a punch press is generally used in conjunction with a special bending die to bend the workpiece. Even when a folding knife upper die and V-groove dies of different angles are used to perform simple angle bending on the workpiece, it is necessary to manually adjust the bending force and bending position to achieve the final bending effect. The bending accuracy is not high. If the bending structure of the bent workpiece is complex and the bending angle is large and limited by the folding knife structure, a special press knife upper die is required to be combined with a special forming lower die or even multiple sets of dies to perform multiple stamping and forming on the workpiece. At the same time, manual verification is also required, which makes the processing procedure complicated, the production efficiency is low, the cost is high, and it is not conducive to mass production. Summary of the invention

[0003] The purpose of the present invention is to provide a sheet metal double-folding and bending method to address the deficiencies in the prior art, get rid of the limitations of bending molds and manual calibration, make bending more flexible and changeable, and achieve intelligent and automated bending process through double-folding and one-time forming.

[0004] Technical solution: The technical solution adopted by the present invention to solve the problem is: a sheet metal double folding and bending method, characterized in that it includes the following steps:

[0005] 1) Select the fully automatic sheet metal bending processing device, move the upper and lower bending knives of the device to the first knife bending position on the X-axis and Z-axis, move the upper pressing knife to the set initial position, return the upper and lower pressing claws in the U-axis assembly to the position pressing the bent workpiece, return the W-axis assembly to the initial position, rotate the C-axis and C1-axis pressing claws to 0 degrees, and move the Y1, Y2, and U1 rulers to the position of the reserved spacing for the bent workpiece. The Y1 and Y2 rulers are raised at the same time, and the U1 axis ruler is lowered;

[0006] 2) After placing the bending workpiece in the reserved position on the work surface, completely fix the bending workpiece, and make the bending edge of the bending workpiece face the upper and lower pressing knives, the bending line is parallel to the top surface of the pressing knife tip, and send the bending workpiece to the first knife bending position;

[0007] 3) Through the operation of step 2), the bending edge of the bent workpiece is located between the upper and lower pressing knives, and the bending begins. The upper pressing knife presses the bent workpiece, and the Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bent workpiece to achieve upward bending or downward bending. The X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. The first knife angle bending of the bent workpiece can be achieved by controlling the moving distance of the Z-axis and the X-axis;

[0008] 4) On the basis of step 3), the workpiece is continuously bent by the sheet metal double bending method to increase the bending angle. The specific method is as follows: the upper pressing knife completely presses the workpiece, and the bending knife moves to the position of the first bending of the workpiece; the Z axis of the bending knife is adjusted to rise or fall, and the X axis moves forward at the same time, so that the bending knife bends in an arc manner, and the workpiece is bent greater than 90°. At this time, the acute bending angle is 40-45°, which is close to the angle of the pressing knife tip; then the Z and X axes of the bending knife retreat again to the position prepared for the second bending, the upper pressing knife of the W axis is lifted, the bending workpiece is released, and the U axis assembly transports the bent workpiece forward, and the W axis moves forward. The upper pressure knife presses down to hold the bent workpiece, the Z axis of the bending knife continues to bend upward or downward, and the X axis bends forward, so that the bending knife continues to bend in a circular arc. After that, the X and Z axes are linked to return to the set folding position, waiting for the workpiece to be transported forward for the next bending. The above bending steps are repeated, and the bending angle is continuously increased, and finally a large-angle bending of the bent workpiece is achieved.

[0009] Preferably, in step 4), the Z axis of the bending knife is adjusted to rise or fall by 0-20 mm, while the X axis moves forward by 0-20 mm; and the U axis moves forward by 2 mm.

[0010] Preferably, the specific operations in step 1) are as follows: turn on the X-axis motor in the base assembly, the X-axis screw drives the slide assembly, the Z-axis motor in the slide assembly controls the Z-axis screw to drive the tool holder assembly to move the upper and lower bending knives X-axis and Z-axis to the first knife folding position, and then in the W-axis assembly, the W-axis motor controls the W-axis screw to drive the lower pressing assembly to move so that the upper pressing knife runs to the set initial position. At the same time, the arm pressing assembly in the U-axis assembly carries the upper and lower pressing claws back to the position of pressing the bent workpiece under the drive of the U-axis motor.

[0011] Preferably, the specific operation in the step 2) is as follows: when the bent workpiece is placed in the reserved position on the worktable, the U1-axis ruler in the U-axis assembly rises, and the bent workpiece is exactly located between the three rulers Y1, Y2, and U1. Then the three rulers Y1, Y2, and U1 run to the clamping position to clamp the bent workpiece, and the W1-axis pressure claw presses down to press the bent workpiece. At this time, the bent workpiece is completely fixed, and the bending edge position of the bent workpiece must be directly opposite the upper and lower pressure knives, and the bending line is parallel to the top surface of the pressure knife tip. Then the Y1, Y2, and U1 rulers retreat to the spacing position reserved for the bending workpiece clamping position, and then the three rulers descend at the same time, the U-axis motor starts, and the U-axis assembly clamps the bent workpiece through the upper and lower pressure claws and moves it to the pressure knife position and sends it to the first knife bending position.

[0012] Preferably, the fully automatic sheet metal bending processing device is configured as a bending mechanism of the LHA02-2000P model, which can realize 9-axis concurrent linkage and a maximum of 44-axis linkage, and is provided with an automatic bending and pressing mechanism, a self-driven integrated loading and unloading automation component, and an automatic bending mechanism.

[0013] Beneficial effect: Compared with the prior art, the present invention has the following advantages: the radius double-bending bending method of the present invention is that after the first knife bending, the bending knife rises or falls on the Z axis and moves forward on the X axis at the same time, so that the bending knife can bend in a circular arc, so that the workpiece can be bent greater than 90°, and then the above actions are repeated to reach the limit angle of the pressing knife tip, or even exceed the limit angle of the pressing knife tip, so as to achieve large-angle bending of the bending workpiece; the present invention improves the forming efficiency of large-angle bending of sheet metal and reduces production costs, gets rid of the limitations of bending molds and manual verification, makes bending more flexible and changeable, and realizes intelligent and automated bending process through double-bending forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the bending diagram of the present invention.

[0015] Figure 2 It is a schematic diagram of the double-folding bending angle of the present invention;

[0016] Figure 3 This is a diagram showing the relationship between the axial movements of the bending machine in the present invention. DETAILED DESCRIPTION

[0017] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0018] Example 1

[0019] The fully automatic sheet metal bending process used in this embodiment is a flexible bending center model LHA02-2000P produced by Nanjing Lanhao Intelligent Technology Co., Ltd. The flexible bending center can realize 9-axis concurrent linkage and a maximum of 44-axis linkage. It is equipped with an automatic bending and pressing mechanism, a self-driven loading and unloading integrated automation component, and an automatic bending mechanism. The bending mechanism consists of a base component, a slide assembly, a W-axis assembly, a pressing assembly, a tool holder assembly, and a U-axis assembly; the specific axial motion relationship is as follows Figure 3 As shown:

[0020] X-axis: controls the forward and backward movement of the bending knife (dual drive);

[0021] U axis: controls the forward and backward movement of the arm press frame;

[0022] U1 axis: controls the front ruler to move forward and backward;

[0023] Y1 axis: controls the left Y ruler to move left and right;

[0024] Y2 axis: controls the right Y ruler to move left and right;

[0025] C axis: controls the rotation of C axis chuck;

[0026] C1 axis: controls the rotation of C1 axis chuck;

[0027] Z axis: controls the bending knife to move up and down

[0028] Z1 axis: controls the left power hinge knife side knife to move up and down;

[0029] Z2 axis: controls the right power hinge knife side knife to move up and down;

[0030] W axis: controls the upper pressing knife to move up and down (dual drive);

[0031] W1 axis: controls the up and down movement of the C1 axis chuck.

[0032] The specific implementation plan for double bending is as follows: Before starting the bending, a series of preparatory actions are required: first, in the base assembly, the X-axis motor is started, and the X-axis screw drives the slide assembly. The Z-axis motor in the slide assembly controls the Z-axis screw to drive the tool holder assembly to move the upper and lower bending knives X-axis and Z-axis to the position of the first knife bending. Then in the W-axis assembly, the W-axis motor controls the W-axis screw to drive the pressing assembly to move, so that the upper pressing knife runs to the set initial position. Finally, the U-axis assembly returns to the position of pressing the bent workpiece under the drive of the U-axis motor, among which the W1-axis pressing claw returns to the initial position, the C-axis and C1-axis pressing claws rotate to 0 degrees, and the Y1, Y2, and U1 rulers run to the position of the reserved spacing for the bent workpiece. The Y1 and Y2 rulers rise at the same time, and the U1-axis ruler is lowered.

[0033] After the preparation action is completed, the feeding action before bending begins: when the bent workpiece is placed in the reserved position on the worktable, the U1-axis ruler in the U-axis assembly rises. At this time, the bent workpiece is exactly located between the three rulers Y1, Y2, and U1. Then the three rulers Y1, Y2, and U1 run to the clamping position to clamp the bent workpiece. The W1-axis pressure claw presses down to press the bent workpiece. At this time, the bent workpiece is completely fixed, and the bending edge position of the bent workpiece must be directly opposite the upper and lower pressure knives. The bending line is parallel to the top surface of the pressure knife tip. Then the Y1, Y2, and U1 rulers retreat to the spacing position reserved for the bending workpiece clamping position, and then the three rulers descend at the same time, the U-axis motor starts, and the U-axis assembly clamps the bent workpiece through the upper and lower pressure claws and moves it to the pressure knife position and sends it to the first knife bending position.

[0034] After the feeding is completed, the bending edge of the bending workpiece is located between the upper and lower pressing knives, and the bending action can begin. The W-axis motor controls the lower pressing assembly to move downward, and the upper pressing knife completely presses the bending workpiece. The Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bending workpiece to achieve upward or downward bending, and the X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. In this way, by controlling the moving distance of the Z-axis and the X-axis, bending at any angle can be achieved within a large range without interfering with the upper and lower pressing knives.

[0035] On this basis, if you want to achieve a larger bending angle, you can use the repeated bending method to continuously bend the workpiece to make the bending angle larger. The specific plan is as follows: the upper pressing knife completely presses the bending workpiece, and the bending knife moves to the position of the first bending of the bending workpiece; the Z axis of the bending knife is adjusted to rise or fall 0-20mm, and the X axis is moved forward 0-20mm at the same time, so that the bending knife bends in a circular arc, and the workpiece is bent greater than 90°. At this time, the acute bending angle is 40-45°, which is close to the angle of the pressing knife tip; then the Z and X axes of the bending knife retreat again to the position prepared for the second bending, the upper pressing knife of the W axis is lifted up, and the bending workpiece is released. The U axis assembly transports the bending workpiece forward 2mm, and the upper pressing knife of the W axis is pressed down to press the bending workpiece. The Z axis of the bending knife continues to bend upward or downward, and the X axis bends forward, so that the bending knife continues to bend in a circular arc. Then, the X and Z axes are linked to return to the set position to be folded, waiting for the workpiece to be transported forward for the next bending. The above bending steps are repeated, and the bending angle is continuously increased, so that the large-angle bending of the bending workpiece is finally achieved. The bending effect is as follows Figure 1 shown.

[0036] The multiple bending method of the present invention is to continuously transport the workpiece forward through the U-axis assembly, while adjusting the Z-axis of the bending tool to rise or fall and cooperate with the X-axis to move forward, continuously bending, so that the bending angle continues to increase, and finally reaches the limit angle of bending. In this embodiment, the limit angle of the Lanhao standard series tool is 155°.

[0037] For example, Figure 2 As shown, the standard tip angle of the upper or lower pressing tool is 40°, so under normal circumstances the workpiece can only be folded 140°. If the folding angle is smaller than the tip angle, the workpiece needs to be continuously moved forward and bent, and eventually the workpiece can be bent to fit the 24.59° bevel surface of the tip. If a smaller bending angle is to be achieved, it can be achieved by customizing the angle of the tool.

[0038] The above specific implementation is only a preferred embodiment of the present invention and is not intended to limit the implementation of the present invention and the scope of the claims. All equivalent changes and modifications made according to the content of the patent protection scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A sheet metal re-bending method, characterized in that: The following steps are involved: 1) Select the fully automatic sheet metal bending processing device, move the upper and lower bending knives of the device to the first bending position on the X-axis and Z-axis, move the upper pressing knife to the set initial position, return the upper and lower pressing claws in the U-axis assembly to the position pressing the bent workpiece, return the W-axis assembly to the initial position, rotate the C-axis and C1-axis pressing claws to 0 degrees, and move the Y1, Y2, and U1 rulers to the position of the reserved spacing for the bent workpiece. The Y1 and Y2 rulers are raised at the same time, and the U1 axis ruler is lowered; The specific operation is as follows: turn on the X-axis motor in the base assembly, the X-axis screw drives the slide assembly, the Z-axis motor in the slide assembly controls the Z-axis screw to drive the tool holder assembly to move the upper and lower bending knives X-axis and Z-axis to the first knife folding position, and then in the W-axis assembly, the W-axis motor controls the W-axis screw to drive the lower pressing assembly to move, so that the upper pressing knife runs to the set initial position. At the same time, the arm pressing assembly in the U-axis assembly carries the upper and lower pressing claws back to the position of pressing the bent workpiece under the drive of the U-axis motor; 2) After placing the bending workpiece in the reserved position on the work surface, completely fix the bending workpiece, and make the bending edge of the bending workpiece face the upper and lower pressing knives, the bending line is parallel to the top surface of the pressing knife tip, and send the bending workpiece to the first knife bending position; The specific operation is as follows: After the bending workpiece is placed in the reserved position on the worktable, the U1-axis ruler in the U-axis assembly rises. At this time, the bending workpiece is exactly located between the three rulers Y1, Y2, and U1. Then the three rulers Y1, Y2, and U1 run to the clamping position to clamp the bending workpiece. The W1-axis pressure claw presses down to press the bending workpiece. At this time, the bending workpiece is completely fixed, and the bending edge position of the bending workpiece must be directly opposite the upper and lower pressure knives. The bending line is parallel to the top surface of the pressure knife tip. Then the Y1, Y2, and U1 rulers retreat to the spacing position reserved for the bending workpiece clamping position. Then the three rulers descend at the same time, the U-axis motor starts, and the U-axis assembly clamps the bending workpiece through the upper and lower pressure claws and moves it to the pressure knife position and sends it to the first knife bending position; 3) Through the operation of step 2), the bending edge of the bent workpiece is located between the upper and lower pressing knives, and the bending begins. The upper pressing knife presses the bent workpiece, and the Z-axis motor controls the tool holder assembly to move up and down, so that the upper and lower bending knives squeeze the bent workpiece to achieve upward bending or downward bending. The X-axis slide assembly moves forward to control the bending knife in the tool holder assembly to bend forward. By controlling the moving distance of the Z-axis and the X-axis, the angle bending of the first knife of the bent workpiece can be achieved; 4) On the basis of step 3), the workpiece is continuously bent by the sheet metal double bending method to increase the bending angle. The specific method is as follows: the upper pressing knife completely presses the workpiece, and the bending knife moves to the position of the first bending of the workpiece; the Z axis of the bending knife is adjusted to rise or fall, and the X axis is moved forward at the same time, so that the bending knife bends in an arc manner, and the workpiece is bent greater than 90°. At this time, the acute bending angle is 40-45°, which is close to the angle of the pressing knife tip; then the Z and X axes of the bending knife retreat again to the first bending position. At the position where the two knives are ready for bending, the upper pressure knife on the W axis is lifted up to release the bent workpiece, the U axis assembly transports the bent workpiece forward, the upper pressure knife on the W axis is pressed down to hold the bent workpiece, the bending knife Z axis continues to bend upward or downward, and the X axis bends forward, so that the bending knife continues to bend in an arc manner, and then the X axis and Z axis are linked to return to the set waiting position, waiting for the workpiece to be transported forward for the next knife bending, and the above bending steps are repeated, and the bending angle is continuously increased, and finally a large-angle bending of the bent workpiece is achieved; The standard tip angle of the upper or lower pressing knife is 40°, so under normal circumstances the workpiece can only be folded 140°. If the angle to be folded is smaller than the tip angle, the workpiece needs to be continuously moved forward and bent, and eventually the workpiece can be bent to fit the 24.59° bevel surface of the tip.

2. A sheet metal re-bending method according to claim 1, characterized in that: In step 4), the Z axis of the bending knife is adjusted to rise or fall by 0-20 mm, while the X axis moves forward by 0-20 mm; and the U axis moves forward by 2 mm.

3. A sheet metal re-bending method according to claim 1, characterized in that: The fully automatic sheet metal bending processing device is configured as a bending mechanism of the LHA02-2000P model, which can realize 9-axis concurrent linkage and a maximum of 44-axis linkage, and is provided with an automatic bending and pressing mechanism, a self-driven integrated loading and unloading automation component, and an automatic bending mechanism.

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